those wheels are only 7mm further out than OEM wheels (i.e. like running with a 7mm spacer). They'll fill the arches better, but it really depends on what look you're going for. most people tend to run a 10mm spacer so you could try a 3mm spacer but tbh i don't see the point
there is no issues with using wobble bolts with spacers, but you need to ensure that you have the correct size spigots otherwise the movement of the wheel and the wobble bolts may mean the bolts work themselves loose